libata: make WARN_ON conditions in ata_sff_hsm_move() more strict

WARN_ON()'s in ata_hsm_move() was too liberal and got triggerred when it shouldn't (e.g. hotplug events at the right moment). As the HSM only deals with device errors and state machine violations, make it check only against them.

---
drivers/ata/libata-sff.c | 4 ++--

1 file changed, 2 insertions(+), 2 deletions(-)

index 1549952..2ec65a8 100644
@@ -1208,7 +1208,7 @@ fsm_start:

		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
			ap->print_id, qc->dev->devno, status);

- WARN_ON(qc->err_mask);
+ WARN_ON(qc->err_mask & (AC_ERR_DEV | AC_ERR_HSM));

		ap->hsm_task_state = HSM_ST_IDLE;

@@ -1222,7 +1222,7 @@ fsm_start:

		/* make sure qc->err_mask is available to
		 * know what's wrong and recover
		 */

- WARN_ON(qc->err_mask == 0);
+ WARN_ON(!(qc->err_mask & (AC_ERR_DEV | AC_ERR_HSM)));

		ap->hsm_task_state = HSM_ST_IDLE;